JP3748672B2 - Aramid film roll - Google Patents

Description

ここで、Ｘは、−Ｏ−、−ＣＨ₂ −、−ＳＯ₂ −、−Ｓ−、−ＣＯ−の中から選ばれる。また、これらの芳香環の水素原子の一部が、ハロゲン基、ニトロ基、スルホン基、アルキル基、アルコキシ基等で置換されていてもよい。
【００１４】
Ａｒ₁ ，Ａｒ₂ およびＡｒ₃ はいずれも２種以上であってもよく、また相互に同じであっても異なっていてもよい。
本発明に用いられるポリマーは、これまでに知られた方法により、各々の単位に対応するジアミン、ジカルボン酸、アミノカルボン酸より製造することができる。具体的には、カルボン酸基をまず酸ハライド、酸イミダゾライド、エステル等に誘導した後にアミノ基と反応させる方法を用いることができ、重合の形式もいわゆる低温溶液重合法、界面重合法、溶融重合法、固相重合法等を用いることができる。
本発明に用いる芳香族ポリアミドには、上記した以外の基が約１０モル％以下共重合されたり、他のポリマーがブレンドされたりしていてもよい。本発明に用いられる芳香族ポリアミドとして最も代表的なものは、ポりーｐ−フェニレンテレフタルアミド（ＰＰＴＡ）である。
【００１５】
パラ系アラミドは融点が高く溶融成形できないため、溶媒に溶解して溶液（以下「ドープ」と称する。）を調整し、湿式法、乾式法、または乾湿式法で製膜する。有機溶剤に難溶性のＰＰＴＡでは、ポリマーを濃硫酸等の無機の強酸に溶解してドープとし、湿式法にて製膜することが行われ、例えば特開昭６２−１７４１１８号公報に示されるように一旦液晶状態で押し出し、光学等方化した後に凝固させる方法が好ましく用いられる。一方、例えば、クロル置換ＰＰＴＡ等の有機溶剤可溶な芳香族ポリアミドでは、重合時に副生する塩酸を中和して重合反応混合物をそのままドープとし、湿式法または乾式法、または乾湿式法にて製膜する方法が好ましく用いられる。
【００１６】
ドープをフィルム状に成形する方法は、本発明を実施する上で特に限定されるものではなく、ダイから直接凝固浴に押し出す方法、ダイから一旦エンドレスベルト上にキャストするか、エンドレスベルト上にドクターナイフやその他の方法でドープをコーティングした後、ベルト上で溶剤を蒸発させるか、ベルトと共に凝固浴に導いて湿式凝固させる方法がある。
この様に製膜されたフィルムは、必要あれば重合時に副生する酸や溶解に用いた酸を中和処理した後、溶剤や無機塩等の溶解助剤を除去するために水または温水、更に必要あれば有機溶剤により洗浄される。
【００１７】
洗浄されたフィルムは乾燥されるが、望むならば乾燥に先立って延伸することもできる。即ち、乾燥前の湿潤フィルムを１方向または２方向に１．０１〜１．４倍程度延伸することにより機械的性質を向上させることができる。
フィルムの乾燥は、通常緊張下、定長下または僅かに延伸しつつ、行うのが好ましい。このような乾燥を行う方法として、例えばテンター乾燥機や金属枠に固定して乾燥することができる。乾燥温度は、通常、１００℃〜３００℃の範囲にとられる。
【００１８】
乾燥フィルムは、必要あれば３００℃以上、５００℃以下の熱処理を受けた後、巻芯上に巻き取られてフィルムロールを形成する。ここで熱処理は、緊張下、定長下または弛緩状態で行うことができ、これらの組み合わせで２段階以上で行うこともできる。
フィルムをロール状に巻き取るに当たって、フィルムの幅方向の厚みむらによりロールに太さむらやいわゆるゲージバンドが生じることを軽減するために、フィルムを蛇行させつつ巻き取ることも好ましい実施態様である。
巻き取りに当たって、フィルムの耳を切り取り、ロールの端面を揃えることも行われてよい。
【００１９】
本発明を実施する上で、フィルムロールの外径、フィルム幅等の寸法については何らの制限はない。また、巻芯の寸法、材質等についても本発明の効果を損ねない限り制限されるものではない。
フィルムロールは汚れなどを防止するためポリエチレンなどの汎用のフィルムや防湿フィルムにより包装されることも行われてよく、また包装に先立って、または包装された後、保護のために緩衝材等を巻き付ける等の方法を付加されることも、本発明の効果を損ねない限り許される。
フィルムロールは持ち運びなどを容易にし、また傷付きを防止する上で、段ボール箱等の収納容器に納められることも好ましい。
【００２０】
【発明の実施の形態】
以下に実施例、比較例などにより発明の実施態様、効果を示すが、本発明はこれらに限られるものではない。また、例中の百分率等は特に示さない限り重量ベースのものである。
〔特性の測定法〕
本発明の特性値の測定法は次の通りである。
（１）厚みおよび厚み斑の測定法
フィルムの厚み斑は、デジタル電子マイクロメータ（アンリツ株式会社製Ｋ３５１Ｃ型）により直径２ｍｍの測定子を用いて、フィルムの幅方向に厚みを測定し、フィルムの平均厚みは測定した全測定値の平均値で、厚み斑は最大値と最小値の差の平均厚みに対する百分率で表す。
（２）強度、伸度、弾性率の測定法
強度、伸度、弾性率は、定速伸長型強伸度測定機を用い、測定長１００ｍｍ、引っ張り速度５０ｍｍ／分で測定したものである。
（３）水分透過率の測定法
ＡＳＴＭ、Ｆ−３７２に準拠し、試料を４０℃、９０％ＲＨの環境下に２４時間以上放置した後、同じ条件下で測定した。
【００２１】
〔実施例および比較例に用いたフィルムロールの製造〕
ＰＰＴＡを、予め０．０４μｍのシリカ粒子をＰＰＴＡに対し０．３％となるように超音波ホモジナイザにより分散させた９９．９％濃硫酸に、ポリマー濃度が１２％になるように溶解し、ＰＰＴＡのドープを調整した。
このＰＰＴＡドープをダイから１０ｍ／分の速度で移動するタンタル製のエンドレスベルト上にキャストした。次いで、ベルト上で加熱と同時に吸湿処理して、ドープを液晶相から等方相に相転換した後、１０℃の４０％硫酸中にて凝固させた後、中和、水洗し、縦方向に１．１倍に延伸した後、クリップテンターにより横方向に１．１倍の延伸を施し、定長状態を保ちつつ熱風乾燥し、次いでテンターでフィルムを保持したまま４３０℃で熱処理した後、３００ｍの周期で幅方向に６０ｍｍ蛇行させつつ巻取機に送り、フィルムの両端部をスリットして除き、５０８ｍｍ幅として、５０００ｍの長さを１ロールとして巻き取りフィルムロールを製造した。
得られたＰＰＴＡフィルムは４．５μｍの平均厚みで、幅方向に約６０ｍｍの周期で４．８％の厚みむらがあり、フィルムの物性は長尺方向、幅方向にそれぞれ、強度４１、４２ｋｇ／ｍｍ² 、伸度１４、１２％、弾性率１４８０、１４９０ｋｇ／ｍｍ² であった。
【００２２】
（参考例１）
上記のＰＰＴＡフィルムのロールを巻き取られた直後に、酢酸セルロースをメチルエチルケトンに溶解した溶液を約２ｃｍの幅でロール全幅にわたり塗布し、その上に巻き付けたフィルムの端部を最末端から約３０ｃｍの所を下層フィルムに接着し、フィルムの最末端は下層フィルムに中央部のみを粘着テープにより固定した。このロールをポリエチレン製の袋に入れて、袋の入り口をゴムバンドにて簡単に閉じて、２０℃、６０％ＲＨの恒温恒湿室に１週間放置した。
放置後のロールを取り出してロール外観、フィルムの変形につき観察したところ、ロールの表面は全面にさざ波上のしわが発生していたが、ロール表面のフィルムをはぎ取って行くと約１０ｍ除去後は全くしわが観察されなかった。
【００２３】
（比較例１）
実施例のフィルム端部の接着を実施しなかったほかは全く同様にして、参考例１を繰り返した。１週間放置後のロールは、表面のさざ波上のしわに加えて約２〜３ｍｍの幅の鋭い縦しわが多数発生しており、ロール表面のフィルムをはぎ取って行ったが、数百ｍ以上はぎ取ってもしわは解消しなかった。このしわはフィルムに長さ方向に凸状に続いており、乾燥処理などによっても解消することができなかった。
【００２４】
（実施例１）
上記のＰＰＴＡフィルムロールを巻き取った直後に、そのフィルム端部に両面粘着テープでポリエステルフィルムにアルミ蒸着した透湿度が１．５ｇ／ｍ²・２４ｈｒ・ａｔｍ以下であるものを接着し、ＰＰＴＡフィルムの上に更に１５回、緩みがないように固く巻き付け、その末端を中央部で一ヶ所粘着テープにて固定した。
このロールを、透湿度が４．０ｇ／ｍ²・２４ｈｒ・ａｔｍであるバリアロンＣＸ、タイプ２４Ｌ（旭化成工業株式会社製；商標、ポリ塩化ビニリデン系樹脂とポリエチレンの複合フィルム）製の袋に入れた上、入り口をヒートシールした。通常の室内に３ヶ月間放置した後、ロールを取り出し、アルミ蒸着フィルムを除去してロール外観、フィルムの変形を観察したところ、全く異常は見られなかった。
【００２５】
（比較例２）
実施例１においてアルミ蒸着フィルムの接着及び重ね巻きを施さず、ＰＰＴＡフィルムの端部の中央部を一ヶ所にみ粘着テープにて固定した外は実施例１を繰り返した。
同様に２ヶ月放置後の観察を実施したところ、表面が全体に緩みが発生していたほか、多数の縦しわが発生しており、この縦しわはフィルムロールの内層にまで達していた。
【００２６】
【発明の効果】
本発明によれば、幅方向に厚みむらのある薄手のパラ系アラミドフィルムであっても、長期保管中にロールには外観、巻き姿の不良発生がなく、フィルムにも縦しわが発生せず、また輸送中の巻きのずれや、しわの発生等がないため、フィルムを加工するに当たってのしわの発生等による工程トラブルが発生せず、また最終製品の特性や品質を低下する問題が発生しないため、高密度記録用磁気テープや、高速度、高画質印刷が要求される熱転写シート等に用いて有用である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a para-aramid film, and more particularly, to a roll (film roll) of a para-aramid film.
[0002]
[Prior art]
In order to protect a roll of a highly hygroscopic film such as a nylon film from moisture absorption during storage or transportation before use, it is known to provide means such as moisture-proof packaging. Further, even a polyester film having a relatively low hygroscopic property is subjected to moisture-proof packaging for use in applications requiring high precision processing such as a magnetic tape.
[0003]
In recent years, para-aramid films, which have been attracting attention for their heat resistance and high mechanical properties, satisfy the rigidity and heat resistance required for handling even thin films. Although it has been used as a base film for magnetic tapes for density recording, aramid has an intermediate moisture absorption property between nylon and polyester, and film expansion due to moisture absorption cannot be ignored. Often causes deformation and wrinkling of the film.
[0004]
[Problems to be solved by the invention]
Moisture-proof packaging has already been proposed to prevent deformation and wrinkling of para-aramid film rolls during storage, but slight moisture cannot be prevented from entering, and not only the roll surface but also the inner layer film. As a result, continuous wrinkles (hereinafter referred to as vertical wrinkles) along the roll winding direction are generated, and the wrinkles remain formed on the film after processing, which causes poor performance of the final product.
[0005]
[Means for Solving the Problems]
The present invention accumulates various analyzes and examinations on the roll of para-aramid film, and the vertical wrinkle generated in the roll is unintentionally related to the thickness unevenness of the film in a specific thing, and the vertical wrinkle reaching the inner layer of the roll The present invention was completed by finding out that it was specifically generated in a thin part of my film.
That is, the object of the present invention is to roll a para-aramid film roll having a thickness of 1 to 9 μm and a thickness variation in the width direction of 1 to 10%, wherein the para-aramid film roll is wound while meandering the film. , and the Ri such sealed between the lower film in contact therewith and end winding end of the film across the entire width, and that the moisture permeability is sealed in the following moisture-proof film 10g / m ² · 24hr · atm para- Solved by aramid film roll.
[0006]
The para-aramid film targeted by the present invention has a thickness in the range of 1 to 9 μm, and a film having a thickness exceeding 9 μm increases the rigidity of the film. Further, when the film has unevenness in the width direction of 1% or more of the average thickness, the vertical wrinkles that are the subject of the present invention tend to reach the lower layer of the roll. Moreover, since the film whose thickness unevenness in the width direction exceeds 10% is not suitable for use in high-grade applications, it is not an object of the present invention.
[0007]
What is important in the present invention is to prevent moisture from entering the inside of the roll through the film from between the end of the outermost layer film that has been wound into a roll and the lower layer film in contact therewith, This is achieved by adhering the film winding end edge to the lower layer film with an adhesive or with an adhesive tape or the like over the entire width and sealing. Here, the film end to be sealed does not need to be precisely the most end, and may be a portion entering the inner layer of the roll with a length of several tens of centimeters to several meters from the most end.
[0008]
In addition, a moisture-proof film having a moisture permeability of 10 g / m ² · 24 hr · atm or less, preferably 5 g / m ² · 24 hr · atm or less is adhered to the end of winding of the aramid film with an adhesive or adhesive tape over the entire width. However, the moisture-proof film can also be achieved by overlapping the aramid film twice or more, preferably 5 times or more. Of course, it is also a preferred embodiment that the end portions of the wound moisture-proof film are bonded over the entire width. Here, it is sufficient if the width of the moisture-proof film is substantially the same as the width of the aramid film. However, in many cases, a slight width does not cause a problem.
[0009]
Known moisture-proof films include polyacrylonitrile film, polyvinylidene chloride film, polyvinylidene fluoride film, para-aramid film, etc., and a composite of polyethylene or polypropylene and polyvinylidene chloride by a coextrusion method or coating method. And cellophane coated with polyvinylidene chloride, polyethylene film, polyester film and the like with metal aluminum laminated.
[0010]
There is no particular restriction on the thickness of the moisture-proof film, but a too thin film will have high moisture permeability and may be damaged during handling and transportation. A too thick film will increase the film rigidity and the moisture-proof film. In order to impair the adhesion, the range of about 10 μm to 200 μm is usually selected.
The roll of the present invention with the film end sealed is further packaged with a moisture-proof film having a moisture permeability of 10 g / m ² · 24 hr · atm or less, preferably 5 g / m ² · 24 hr · atm or less. It is carried out to reduce moisture absorption. Furthermore, when packaging a roll with a moisture-proof film, it is also preferable to simultaneously package a hygroscopic agent such as quicklime or a high-performance absorbent such as silica gel.
[0011]
The para-aramid of the present invention is substantially composed of units selected from the group consisting of the following structural units.
—NH—Ar ₁ —NH— (1)
—CO—Ar ₂ —CO— (2)
—NH—Ar ₃ —CO— (3)
Here, Ar ₁ , Ar ₂ , and Ar ₃ are each a divalent group containing at least one aromatic ring, and (1) and (2) are substantially equimolar when present in the polymer. is there.
[0012]
In the present invention, in order to ensure good mechanical performance and dimensional stability, each of Ar ₁ , Ar ₂ , and Ar ₃ needs to be a para-oriented group.
Here, the para-oriented type means that the bonding direction of the main chain in the aromatic ring is located in the para position, or the bonding direction of the main chain at both ends in the residue composed of two or more aromatic rings is coaxial or parallel. It means that there is. Typical examples of such divalent aromatic groups include groups represented by the following chemical formula (1).
[0013]
[Chemical 1]

Here, X is selected from —O—, —CH ₂ —, —SO ₂ —, —S—, and —CO—. Some of the hydrogen atoms of these aromatic rings may be substituted with a halogen group, a nitro group, a sulfone group, an alkyl group, an alkoxy group, or the like.
[0014]
Ar ₁ , Ar ₂ and Ar ₃ may be two or more, and may be the same or different from each other.
The polymer used in the present invention can be produced from a diamine, a dicarboxylic acid and an aminocarboxylic acid corresponding to each unit by a conventionally known method. Specifically, it is possible to use a method in which a carboxylic acid group is first derived into an acid halide, acid imidazolide, ester or the like and then reacted with an amino group. The polymerization method is also a so-called low temperature solution polymerization method, interfacial polymerization method, melting method. A polymerization method, a solid phase polymerization method, or the like can be used.
In the aromatic polyamide used in the present invention, groups other than those described above may be copolymerized in an amount of about 10 mol% or less, or other polymers may be blended. The most typical aromatic polyamide used in the present invention is poly-p-phenylene terephthalamide (PPTA).
[0015]
Since para-aramid has a high melting point and cannot be melt-molded, it is dissolved in a solvent to prepare a solution (hereinafter referred to as “dope”), and a film is formed by a wet method, a dry method, or a dry-wet method. In PPTA, which is hardly soluble in organic solvents, a polymer is dissolved in a strong inorganic acid such as concentrated sulfuric acid to form a dope, and a film is formed by a wet method. For example, as disclosed in JP-A-62-174118 For example, a method of once extruding in a liquid crystal state and solidifying after optical isotropy is preferably used. On the other hand, for example, in an aromatic solvent-soluble aromatic polyamide such as chloro-substituted PPTA, the polymerization reaction mixture is neutralized by neutralizing hydrochloric acid produced as a by-product at the time of polymerization, and subjected to a wet method, a dry method, or a dry and wet method. A film forming method is preferably used.
[0016]
The method for forming the dope into a film is not particularly limited for carrying out the present invention. The method for extruding the dope directly from the die to the coagulation bath, once cast from the die onto the endless belt, or doctor on the endless belt. After the dope is coated with a knife or other method, the solvent is evaporated on the belt, or it is guided to a coagulation bath together with the belt and wet coagulated.
The film formed in this manner is neutralized with acid used as a by-product during polymerization or the acid used for dissolution, if necessary, and then water or hot water to remove the dissolution aid such as solvent and inorganic salt, If necessary, it is washed with an organic solvent.
[0017]
The washed film is dried, but can be stretched prior to drying if desired. That is, the mechanical properties can be improved by stretching the wet film before drying about 1.01 to 1.4 times in one or two directions.
The film is preferably dried under normal tension, constant length or slightly stretched. As a method for performing such drying, for example, it can be fixed to a tenter dryer or a metal frame and dried. The drying temperature is usually in the range of 100 ° C to 300 ° C.
[0018]
If necessary, the dried film is subjected to a heat treatment at 300 ° C. or more and 500 ° C. or less and then wound on a core to form a film roll. Here, the heat treatment can be performed under tension, under a constant length, or in a relaxed state, and can be performed in two or more stages by combining these.
In winding the film into a roll, it is also a preferred embodiment to wind the film while meandering in order to reduce the occurrence of uneven thickness and so-called gauge bands on the roll due to uneven thickness in the width direction of the film.
Upon winding, the film ears may be cut off and the roll end faces may be aligned.
[0019]
In carrying out the present invention, there are no restrictions on the dimensions of the film roll such as the outer diameter and the film width. Further, the dimensions and materials of the winding core are not limited as long as the effects of the present invention are not impaired.
The film roll may be wrapped with a general-purpose film such as polyethylene or a moisture-proof film in order to prevent dirt and the like, and a cushioning material or the like is wrapped for protection before or after packaging. It is permissible to add such a method as long as the effect of the present invention is not impaired.
The film roll is preferably stored in a storage container such as a cardboard box in order to facilitate carrying and preventing damage.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments and effects of the present invention will be shown below by examples and comparative examples, but the present invention is not limited to these. Further, percentages and the like in the examples are based on weight unless otherwise indicated.
[Measurement method of characteristics]
The measuring method of the characteristic value of the present invention is as follows.
(1) Measuring method of thickness and thickness unevenness The thickness unevenness of the film was measured with a digital electronic micrometer (K351C type manufactured by Anritsu Co., Ltd.) using a 2 mm diameter probe in the width direction of the film. The average thickness is the average value of all the measured values, and the thickness variation is expressed as a percentage of the average thickness of the difference between the maximum value and the minimum value.
(2) Measurement Method of Strength, Elongation, and Elastic Modulus Strength, elongation, and elastic modulus were measured using a constant speed extension type high elongation measuring machine at a measurement length of 100 mm and a pulling speed of 50 mm / min.
(3) Measuring method of water permeability According to ASTM, F-372, the sample was left in an environment of 40 ° C. and 90% RH for 24 hours or more, and then measured under the same conditions.
[0021]
[Production of Film Rolls Used in Examples and Comparative Examples]
PPTA was dissolved in 99.9% concentrated sulfuric acid in which 0.04 μm silica particles were dispersed in advance by an ultrasonic homogenizer so as to be 0.3% with respect to PPTA so that the polymer concentration became 12%. The dope was adjusted.
The PPTA dope was cast on a tantalum endless belt moving from the die at a speed of 10 m / min. Next, moisture is absorbed simultaneously with heating on the belt, the dope is phase-converted from the liquid crystal phase to the isotropic phase, solidified in 40% sulfuric acid at 10 ° C., neutralized, washed with water, and vertically After stretching 1.1 times, the film was stretched 1.1 times in the transverse direction by a clip tenter, dried with hot air while maintaining a constant length state, and then heat-treated at 430 ° C. while holding the film with a tenter, then 300 m The film was sent to a winder while meandering 60 mm in the width direction at a period of, and both ends of the film were removed by slitting to produce a wound film roll having a width of 508 mm and a length of 5000 m as one roll.
The obtained PPTA film has an average thickness of 4.5 μm and a thickness unevenness of 4.8% in a cycle of about 60 mm in the width direction. The physical properties of the film are strengths of 41 and 42 kg / mm in the longitudinal direction and the width direction, respectively. mm ² , elongation of 14, 12%, elastic modulus 1480, 1490 kg / mm ² .
[0022]
( Reference Example 1)
Immediately after the roll of the PPTA film was wound, a solution of cellulose acetate dissolved in methyl ethyl ketone was applied over the entire width of the roll with a width of about 2 cm, and the end of the film wound thereon was about 30 cm from the extreme end. The point was adhered to the lower layer film, and the outermost end of the film was fixed to the lower layer film only at the center with an adhesive tape. This roll was put in a polyethylene bag, the entrance of the bag was simply closed with a rubber band, and left in a constant temperature and humidity chamber at 20 ° C. and 60% RH for 1 week.
When the roll after standing was taken out and observed for roll appearance and film deformation, the surface of the roll had ripples on the entire surface, but when the film on the roll surface was peeled off, it was completely removed after about 10 m was removed. No wrinkles were observed.
[0023]
(Comparative Example 1)
Reference Example 1 was repeated in exactly the same manner except that the film edge part of Example was not adhered. The roll after standing for 1 week had many vertical wrinkles with a width of about 2 to 3 mm in addition to the wrinkles on the surface ripples, and the roll surface film was peeled off. But wrinkles did not go away. This wrinkle continued in a convex shape in the length direction of the film, and could not be eliminated even by drying treatment.
[0024]
(Example 1 )
Immediately after winding the PPTA film roll, a film having a moisture permeability of 1.5 g / m ² · 24 hr · atm or less deposited on a polyester film with a double-sided adhesive tape is adhered to the end of the film. It was further tightly wound 15 times so as not to loosen, and its end was fixed with an adhesive tape at one position at the center.
This roll was put in a bag made of Barrieron CX having a moisture permeability of 4.0 g / m ² · 24 hr · atm, type 24L (manufactured by Asahi Kasei Corporation; trademark, a composite film of polyvinylidene chloride resin and polyethylene). The entrance was heat sealed. After leaving it in a normal room for 3 months, the roll was taken out, the aluminum vapor-deposited film was removed, and the appearance of the roll and the deformation of the roll were observed. No abnormality was found.
[0025]
(Comparative Example 2)
Example 1 was repeated except that the aluminum vapor-deposited film was not bonded and overwrapped in Example 1 , and the central part of the end of the PPTA film was seen in one place and fixed with an adhesive tape.
Similarly, when the observation was carried out after standing for 2 months, the surface was loosened as a whole, and many vertical wrinkles were generated, and the vertical wrinkles reached the inner layer of the film roll.
[0026]
【The invention's effect】
According to the present invention, even with a thin para-aramid film having uneven thickness in the width direction, the roll has no appearance or winding failure during long-term storage, and no vertical wrinkles occur in the film. In addition, since there is no slippage or wrinkle during transportation, there will be no process troubles due to wrinkles when processing the film, and there will be no problems that deteriorate the properties and quality of the final product. Therefore, it is useful for magnetic tapes for high density recording, thermal transfer sheets that require high speed and high image quality printing, and the like.

Claims (4)

In a roll of para-aramid film having a thickness of 1 to 9 μm and a thickness variation in the width direction of 1 to 10%, the para-aramid film roll is a roll wound while meandering the film , and the end of winding of the film end and sealed with-than, and para-aramid film roll that is sealed in the moisture permeability in the following moisture-proof film 10g / m ² · 24hr · atm over the entire width between the lower film in contact with it.   The para-aramid film roll according to claim 1, wherein the end of winding of the para-aramid film is bonded to the lower film in contact with the entire width of the para-aramid film roll. The moisture-proof film having a moisture permeability of 10 g / m ² · 24 hr · atm or less is adhered to the end of winding of the para-type aramid film over the entire width, and the moisture-proof film is wound around the aramid film twice or more. Para-aramid film roll. It is a manufacturing method of the para-aramid film roll of Claim 1, Comprising: The process which winds up winding a film roll after a film forming process, and seals between the winding end edge of a film, and the lower layer film which touches it over the full width Process, and the film roll has a moisture permeability of 10 g / m. ² -The manufacturing method of the roll of a para-type aramid film characterized by including the process sealed in the moisture-proof film of 24 hr * atm or less.